You mean you’re not perfect?! Yeah….neither are we. One of the great things about Office Mix is that it is slide based. So, if you make a mistake or want to redo a slide, you just redo that one slide. From inside PowerPoint, just click the Record button on the slide in question. Once inside the Recorder, just click Delete Recording. This will delete the recording on just that one slide. You can then re-record that slide.